a runner or competitor who sets the pace at the beginning of a race or competition, sometimes in order to help another runner break a record
(在赛跑或竞赛开始阶段)定速度的人;领跑者。
a person viewed as taking the lead or setting standards of achievement for others
带头人;标兵。
an artificial device for stimulating the heart muscle and regulating its contractions
(心脏)起搏器。
the part of the heart muscle (the sino-atrial node) which normally performs this role
起搏点,起步点。
the part of an organ or of the body which controls any other rhythmic physiological activity
(控制人体生理活动节奏的)节律器。